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Don't count on fuses Posted by Ari [Email] ![]() ![]() In Reply to: roger that., Steve Y, Fri, 21 Jan 2005 14:24:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The purpose of a fuse is to protect wire from BURNING if there is a short. It is not to protect the electronics. On a given circuit, the wire is sized for the current flow, and then the fuse is rated for the wire. However, because fatter wires cost more money and weigh more (every ounce helps), you can get some pretty thin wires and some pretty big fuses, especially on circuits where there are a lot of things. So don't count on a fuse.
The size of a spark doesn't have a lot to do with current - just voltage, and there is basically only one voltage in a car (other than ignition). Since the gauge doesn't move, it could very easily be a major short in the bundle. It could be a shorted gauge, too. Definately step 1 is to un-tye-wrap the bundle and see the damage (if any).
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